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999999999+88888888+7777777+666666+55555+4444+333+22+1=x
We move all terms to the left:
999999999+88888888+7777777+666666+55555+4444+333+22+1-(x)=0
We add all the numbers together, and all the variables
-1x+1097393685=0
We move all terms containing x to the left, all other terms to the right
-x=-1097393685
x=-1097393685/-1
x=+1097393685
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